<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <script src="./lib/vue.min-2.6.11.js"></script>
</head>

<body>
    <div id="app">
        <input type="button" value="浪起来" v-on:click="lang">
        <input type="button" value="别浪" v-on:click="stop">
        <h3 v-text="msg"></h3>
    </div>
</body>
<script>
    const vm = new Vue({
        el: '#app',
        data: {
            msg: '猥琐发育，别浪······!',
            intervalId: null
        },
        methods: {
            lang: function () {
                if (this.intervalId != null) return;

                const that = this;

                this.intervalId = setInterval(function () {
                    const start = that.msg.substring(0, 1);

                    const end = that.msg.substring(1);

                    that.msg = end + start;
                }, 100)
            },
            stop: function () {
                clearInterval(this.intervalId)
                this.intervalId = null;
            }
        }
    })

    console.log(vm);

</script>

</html>